Updated RequestTextFile -- word-generator.

Now "ends with end-token".

TestCentre/PropertyTests.fs

@@ -139,11 +139,12 @@
             Check.Quick results
 
         [<Property>]
-        let ``RequestTextFromFile returns a string which ends with a full stop when using word-generator`` () =
+        let ``RequestTextFromFile returns a string which ends withwith the correct end-token when using word-generator`` () =
             let test () =
                 Pancake.RequestTextFromFileAsync (ValidGibberishLevelInput()) (ValidSentencesInput()) WordGenerator
                 |> Async.RunSynchronously
-            let results = Assert.EndsWith(".", test())
+                |> EndsAsIntended
+            let results = Assert.True(test())
             Check.Quick results
 
         [<Property>]